Kingdom of Araucanía and Patagonia - Wikipedia
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The kingdom of Patagonia was not a recognized state, and was founded to keep chile and Argentina away. It was also founded by the "house of tounens," which consisted of two men who I am giving far too much credit. However, your goal is to get it recognized (probably the hard part) and pass the throne down to the house of Wurtenburg of southwest germany. Yes I recognize that's probably as simple as the monarchy surviving and an eventual queen marrying that house